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author | Hou Zhiqiang <Zhiqiang.Hou@nxp.com> | 2017-08-28 13:52:59 +0300 |
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committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-08-30 00:19:48 +0300 |
commit | e44abfed6fcb750d24f4438dc9d5a02eebb5fcac (patch) | |
tree | 1342d713ecddc6bdc7bf40450e8c94d5bc27b3fa /drivers/pci/dwc/pcie-designware.h | |
parent | 4a2745d760facac895c107bed41e167e3806fced (diff) | |
download | linux-e44abfed6fcb750d24f4438dc9d5a02eebb5fcac.tar.xz |
PCI: dwc: Add accessors for write permission of DBI read-only registers
The read-only DBI registers can be written only when the "Write to RO
Registers Using DBI" (DBI_RO_WR_EN) field of MISC_CONTROL_1_OFF is set.
Add accessors to enable and disable write permission, and use them instead
of accessing MISC_CONTROL_1_OFF directly.
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Roy Zang <tie-fei.zang@freescale.com>
Diffstat (limited to 'drivers/pci/dwc/pcie-designware.h')
-rw-r--r-- | drivers/pci/dwc/pcie-designware.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 7366c8167404..0c5f874345f6 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -76,6 +76,9 @@ #define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16) #define PCIE_ATU_UPPER_TARGET 0x91C +#define PCIE_MISC_CONTROL_1_OFF 0x8BC +#define PCIE_DBI_RO_WR_EN (0x1 << 0) + /* * iATU Unroll-specific register definitions * From 4.80 core version the address translation will be made by unroll @@ -279,6 +282,28 @@ static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg) return __dw_pcie_read_dbi(pci, pci->dbi_base2, reg, 0x4); } +static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci) +{ + u32 reg; + u32 val; + + reg = PCIE_MISC_CONTROL_1_OFF; + val = dw_pcie_readl_dbi(pci, reg); + val |= PCIE_DBI_RO_WR_EN; + dw_pcie_writel_dbi(pci, reg, val); +} + +static inline void dw_pcie_dbi_ro_wr_dis(struct dw_pcie *pci) +{ + u32 reg; + u32 val; + + reg = PCIE_MISC_CONTROL_1_OFF; + val = dw_pcie_readl_dbi(pci, reg); + val &= ~PCIE_DBI_RO_WR_EN; + dw_pcie_writel_dbi(pci, reg, val); +} + #ifdef CONFIG_PCIE_DW_HOST irqreturn_t dw_handle_msi_irq(struct pcie_port *pp); void dw_pcie_msi_init(struct pcie_port *pp); |